EP1419948A1 - Tirant et procédé d'assemblage d'un servomoteur - Google Patents

Tirant et procédé d'assemblage d'un servomoteur Download PDF

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Publication number
EP1419948A1
EP1419948A1 EP03078208A EP03078208A EP1419948A1 EP 1419948 A1 EP1419948 A1 EP 1419948A1 EP 03078208 A EP03078208 A EP 03078208A EP 03078208 A EP03078208 A EP 03078208A EP 1419948 A1 EP1419948 A1 EP 1419948A1
Authority
EP
European Patent Office
Prior art keywords
housing
tie rod
booster
captive nut
front wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03078208A
Other languages
German (de)
English (en)
Other versions
EP1419948B1 (fr
Inventor
Michael A. Kasselman
Michael Jean Vermoesen
Patrick T. Maclellan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BWI Co Ltd SA
Original Assignee
Delphi Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP1419948A1 publication Critical patent/EP1419948A1/fr
Application granted granted Critical
Publication of EP1419948B1 publication Critical patent/EP1419948B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/567—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of the casing or by its strengthening or mounting arrangements
    • B60T13/5675—Supportstruts

Definitions

  • This invention relates to vehicle brake systems, and more particularly to vacuum boosters for vehicle brake systems.
  • Vehicles such as automobiles, trucks, buses, and motor homes typically include a dashboard at the front of the passenger compartment, having a power brake booster on the front of the dashboard connected by a push rod to a brake pedal mounted on the rear of the dashboard in the passenger compartment.
  • a brake master cylinder, connected to the braking system, is mounted on the front end of the booster.
  • one commonly used type of brake booster known as a vacuum booster, includes a housing apparatus 12 having a front housing 14 and a rear housing 16, joined together and defining a longitudinal axis 18 of the booster 10.
  • the front housing 14 defines a front wall 20 of the housing 12 and an inner surface 22 of the front wall 20.
  • the rear housing 16 defines a rear wall 24 of the housing 12 and an inner surface 26 of the rear wall 24.
  • a tie rod 28 extends axially through holes 25, 27 in the front and rear walls 20, 24 respectively of the housing 12.
  • the tie rod 28 has a first end 30 engaging the rear wall 24 of the housing 12, and a second end 32 engaging the front wall 20 of the housing 12.
  • the first end 30 of the tie rod 28 includes an annular flange 36 welded or mechanically fastened to the inner surface 26 of the rear wall 24, and a threaded section 34 extending from the annular flange 36, through the hole 27 in the rear wall 24, for mounting the booster 10 on the front of a vehicle dashboard.
  • the second end 32 of the tie rod 28 extends through the hole 25 in the front wall 20 of the housing 12, and is also threaded to receive a special sealing nut 38 that bears against the inner surface 22 of the front wall 20.
  • the threaded portion of the second end 32 of the tie rod 28 extends outward beyond the front wall 20 of the booster 10, for mounting a brake master cylinder to be actuated by the booster 10.
  • the position of the sealing nut 38 on the threads at the second end of the tie rod 28 is adjusted so that once the front and rear housings 14, 16 are joined together, the sealing nut 38 will be properly positioned for applying an axially directed force against the inner surface 22 of the front wall 20 of the housing 12 to achieve a desired axial distance between the front and rear walls 20, 24 of the housing 12.
  • Setting the front and rear walls 20, 24 at a desired axial distance is required to allow proper pre-load of the front and rear housings 14, 16, and proper spacing between internal components of the booster 10, such as the booster piston 40 and a first and second diaphragm support 42, 44 that move with the piston 40, so that the booster 10 can function properly.
  • the booster 10, of FIG. 1 is a tandem vacuum brake booster having a primary and a secondary diaphragm 46, 48, and a divider 41 that separate the interior of the housing 12 into primary and secondary vacuum chambers 50, 52, and primary and secondary high-pressure chambers 51, 53. These chambers must be sealed from one another for proper operation of the booster 10.
  • Air tubes 54 adapted for sealing engagement with the primary diaphragm 46 and the divider 41 of the booster 10, provide sealed passageways for the tie rod 28 to pass through the primary vacuum and high pressure chambers 50, 51, without allowing leakage along the tie rod 28 between the primary vacuum and high pressure chambers 50, 51.
  • Our invention provides a tie rod apparatus and method for adjusting the axial distance between the front and rear walls of the booster, from outside of the booster, after the booster has been assembled.
  • a vacuum booster in one form of our invention, includes a housing having a front housing and a rear housing joined together and defining a longitudinal axis of the booster.
  • the front housing defines a front wall of the housing and an inner surface of the front wall.
  • the rear housing defines a rear wall of the housing and includes a captive nut having threads adapted for threaded engagement with a threaded end of a tie rod.
  • the front and rear walls are spaced an axial distance from one another along the longitudinal axis.
  • a tie rod extends axially through the housing and has a first end engaging the rear wall of the housing and a second end engaging the front wall of the housing. The first end of the tie rod has threads for engaging the threads of the captive nut in the rear wall of the housing.
  • the second end of the tie rod has an axially facing surface thereof for applying an axially directed force against the inner surface front wall of the housing.
  • the axial distance of the housing between the front and rear walls of the housing is adjusted by turning the tie rod, to thread the first end of the tie rod farther in or out of the captive nut.
  • the booster in another form of our invention includes internal elements thereof axially separating the interior of the housing into fluid chambers sealed from one another, and the captive nut includes a tube extending axially therefrom along a part of the tie rod into the interior of the housing through one or more of the fluid chambers.
  • the tube has a surface adapted for sealing engagement with the internal elements of the booster.
  • FIG. 2 illustrates a first exemplary embodiment of a tandem brake booster 110, according to our invention.
  • the booster 110 includes a housing 112 having a front housing 114 and a rear housing 116 joined together and defining a longitudinal axis 118 of the booster 110.
  • the front housing 114 defines a front wall 120 of the housing 110 and an inner surface 122 of the front wall 120.
  • the rear housing 116 defines a rear wall 124 of the housing 112, and includes one or more captive nuts 129 having threads adapted for threaded engagement with a threaded end of a tie rod 128.
  • the captive nuts 129 are attached by a process such as welding, brazing, adhesive bonding, or other means of mechanically fastening, to an inside surface 126 of the rear wall 124 of the housing 112.
  • the front and rear walls 114, 116 are spaced an axial distance from one another along the longitudinal axis 118.
  • a tie rod 128 extends axially through the housing 112 and has a first end 130 engaging the rear wall 124 of the housing 112.
  • a second end 132 of the tie rod 128 engages the front wall 114 of the housing 112.
  • the first end 130 of the tie rod 128 has threads for engaging the threads of the captive nut 129 in the rear wall 124 of the housing 112.
  • the second end 132 of the tie rod 128 has an annular flange 135 including an axially facing surface 137 thereof for applying an axially directed force against the inner surface 122 front wall 120 of the housing 112.
  • the axial distance of the housing 112 between the front and rear walls 120, 124 of the housing 112 in a booster 110 according to our invention can be adjusted after the booster 110 is otherwise assembled, by turning the tie rod 128, to thread the first end 130 of the tie rod 128 farther in or out of the captive nut 126.
  • one or both ends 130, 132 of the tie rod may be formed for engagement with a tool, such as a wrench.
  • the threaded first end 130 of the tie rod 128 extends beyond the rear wall 124 of the booster, through the captive nut 129 and a hole 127 in the rear housing 116, for attaching the booster 110 to a mounting surface such as the front side of the dashboard of a vehicle.
  • the second end 132 of the tie rod 28 includes a threaded portion 134 extending through a hole 125 in the front wall 120 and outward beyond the front wall 120 of the booster 110, for attaching a brake master cylinder to be actuated by the booster 110.
  • a seal 136 in the form of an O-ring or another form of packing, disposed in a trepan groove in the annular flange 135 precludes leakage through the hole 125 around the tie rod 128.
  • a sealant such as an anaerobic microencapsulated glue is applied to the threads of the first end 130 of the tie rod 128 engaging the tie rod 128 for precluding leakage the threads of the tie rod 128 and the captive nut 129.
  • FIG. 3 shows a second embodiment of a booster 110, according to our invention.
  • the embodiment of FIG. 3 is identical to the embodiment shown in FIG. 2, except for the configuration of the second end 132 of the tie rod 128, and the manner in which the second end 132 of the tie rod 128 exerts an axial force against the inner surface 122 of the front wall 120 of the booster 110.
  • the axially facing surface 137 of the tie rod 128 is provided in the form of a shoulder on the tie rod 128.
  • the shoulder 137 bears against an annular sealing washer 138, clamped between the shoulder 137 and the inside surface 122 of the front wall 120.
  • a seal 136 in the form of an O-ring or other type of packing is disposed in a trepan groove in the annular sealing washer 138 to preclude leakage through the hole 125 around the tie rod 128.
  • FIG. 4 shows a third embodiment of a booster 110, according to our invention.
  • the embodiment of FIG. 4 is identical to the embodiment shown in FIG. 3, except that the captive nut 129 includes a tube 156 extending into the booster 110 and having an outer surface 158 adapted for sealing engagement with internal components of the booster 110, in a manner precluding leakage along the tie rod 128 between internal fluid chambers within the booster 110.
  • the booster 110 is a tandem vacuum brake booster 110 having a primary and a secondary diaphragm 146, 148, and a divider 141 that separate the interior of the housing 112 into primary and secondary vacuum chambers 150, 152, and primary and secondary high-pressure chambers 151, 153. These chambers must be sealed from one another for proper operation of the booster 110.
  • the outer surface 158 of the tube 156 extending from the captive nut 129 is adapted for sealing engagement with the primary diaphragm 146, and with a seal 160 attached to the divider 141 of the booster 110, to provide a sealed passageway for the tie rod 128 to pass through the primary vacuum and high pressure chambers 150, 151, without allowing leakage along the tie rod 128 between the primary vacuum and high pressure chambers 150, 151.
  • a sliding seal 155, between the secondary diaphragm 148 and the tie rod 128, precludes leakage around the tie rod 128 between the secondary vacuum and high pressure chambers 152, 153.
  • the tube 156 integral with the captive nut 129 as shown in FIG. 4, the separate air tubes 54 used in the prior art booster shown in FIG. 1 can be eliminated to reduce cost and facilitate manufacturability and reliability of the booster 110. It should be noted, however, that aspects of our invention may be utilized in boosters 110 having air tubes 54 separate from the captive nut 129, as shown in the embodiments of FIGS. 2 and 3. It should be further noted that the air tube 156 extending from the captive nut 129 may be used with the tie rod embodiment shown in FIG. 2, or other tie rod embodiments within the scope of the appended claims.
  • our invention may be practiced in boosters 110 having one or more return springs 161 located and acting parallel to the booster axis 118, rather than a more traditional barrel shaped piston return spring 162 disposed about the booster axis 118, as shown in the embodiments of FIGS. 1-4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
EP03078208A 2002-11-12 2003-10-10 Tirant et procédé d'assemblage d'un servomoteur Expired - Lifetime EP1419948B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US292733 1999-04-15
US10/292,733 US6772674B2 (en) 2002-11-12 2002-11-12 Tie rod apparatus and method for assembling a vacuum booster

Publications (2)

Publication Number Publication Date
EP1419948A1 true EP1419948A1 (fr) 2004-05-19
EP1419948B1 EP1419948B1 (fr) 2011-12-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03078208A Expired - Lifetime EP1419948B1 (fr) 2002-11-12 2003-10-10 Tirant et procédé d'assemblage d'un servomoteur

Country Status (2)

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US (1) US6772674B2 (fr)
EP (1) EP1419948B1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4461320B2 (ja) * 2003-11-28 2010-05-12 日立オートモティブシステムズ株式会社 気圧式倍力装置
FR2902736B1 (fr) * 2006-06-21 2009-03-27 Bosch Gmbh Robert Servomoteur a tirants comportant une bague d'etancheite renforcee.
DE102007049960A1 (de) 2007-10-18 2009-04-23 Lucas Automotive Gmbh Unterdruckbremskraftverstärker für eine Kraftfahrzeugbremsanlage
DE102015217520A1 (de) * 2015-09-14 2017-03-16 Robert Bosch Gmbh Elektromechanischer Bremskraftverstärker und Bremssystem

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5487327A (en) * 1993-09-24 1996-01-30 Lucas Industries Public Limited Company Booster housing, especially for vehicle brake systems, and method of assembling such as booster housing
EP0760319A1 (fr) * 1995-09-01 1997-03-05 LUCAS INDUSTRIES public limited company Unité de servomoteur à dépression d'assistance au freinage et maître-cylindre avec axe de liaison
WO2000061416A1 (fr) * 1999-04-09 2000-10-19 Continental Teves Ag & Co. Ohg Servofrein pneumatique
DE10136379C1 (de) * 2001-07-26 2002-12-05 Lucas Automotive Gmbh Unterdruckbremskraftverstärker mit vereinfachter Montage

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5923653Y2 (ja) * 1979-07-20 1984-07-13 トキコ株式会社 気圧式倍力装置
FR2727922A1 (fr) * 1994-12-09 1996-06-14 Alliedsignal Europ Services Servomoteur a enveloppe deformable
US6164183A (en) 1999-02-10 2000-12-26 Delphi Technologies, Inc. Brake booster with alternate activation by rotary electric motor
US6209442B1 (en) 1999-08-16 2001-04-03 Delphi Technologies, Inc. Brake booster with compressible air valve for braking speed of application enhancement
US6374721B1 (en) 2000-08-08 2002-04-23 Delphi Technologies, Inc. Vacuum booster with retaining mechanism for cylinder cap
US6637837B2 (en) 2001-12-20 2003-10-28 Delphi Technologies, Inc. Vacuum booster air intake via engine compartment breather passage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5487327A (en) * 1993-09-24 1996-01-30 Lucas Industries Public Limited Company Booster housing, especially for vehicle brake systems, and method of assembling such as booster housing
EP0760319A1 (fr) * 1995-09-01 1997-03-05 LUCAS INDUSTRIES public limited company Unité de servomoteur à dépression d'assistance au freinage et maître-cylindre avec axe de liaison
WO2000061416A1 (fr) * 1999-04-09 2000-10-19 Continental Teves Ag & Co. Ohg Servofrein pneumatique
DE10136379C1 (de) * 2001-07-26 2002-12-05 Lucas Automotive Gmbh Unterdruckbremskraftverstärker mit vereinfachter Montage

Also Published As

Publication number Publication date
EP1419948B1 (fr) 2011-12-07
US20040089149A1 (en) 2004-05-13
US6772674B2 (en) 2004-08-10

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